When comparing initial emissions, IAM inventories differ both in base year and emissions values – given their variety of sources from the Emissions Database for Global Atmospheric Research to GAINS to the Radiative Concentration Pathway or even older IPCC inventories . Even after the inventories have been harmonized in the CMIP6 scenarios , their use of an earlier CEDS version leads to differences such as a base-year OC value that is 30 % higher than the updated CEDS value .
Black carbon and OC are driven more by residential emissions, which have limited intensity improvements in CLE but much stronger pollution controls in MFR. The BC emissions are generally higher than their SSP counterparts, as increased activities overpower intensity improvements for residential, commercial, industrial, and waste sectors. Moving to MFR leads to decreases in all sectors except for commercial, while moving to a 2C climate scenario reduces energy and industry but not the others.
Other discrepancies may result from updated model data. Sectoral scaling choices differ between IAMs, as described in Sect. 2.2 of the Supporting Information in Rao et al. . One example is the much higher value for OC waste emissions in SSP1-2.6 versus this study , which comes from a constant-emissions extension of the higher inventory value from the associated IMAGE model .
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